FML Stories Part 2

I Think it's Some HP Joke?

Today, it was raining heavily so I wore my black poncho as I walked to work. On my way there I noticed an old and seemingly homeless man following me. I turned around to confront him. He picked up a stick and screamed "Expecto Patronum!" Apparently I look like a dementor. FML

Dunno where the reference is from k don't judge.